There are a great many websites on Vedic Mathematics and it is not possible to list them all here. The best we can do is give a small selection.

Vedic Mathematics
http://vedicmathematics.blogspot.co.uk/

Hinduism.about
http://hinduism.about.com/od/vedicmaths/a/what_is_vedic_math.htm

Ingenious Academy
http://www.ingenious-academy.com/

Rocket Maths
https://ingenious-academy.com/rocket-maths/

The original Book by Tirthaji
http://www.scribd.com/doc/2062720/vedicmaths-ebook

Master Mind - Course on Vedic Math
http://www.mastermindvedicmaths.com/

School of Vedic Maths
http://sovm.org/

Article on Vedic Maths
http://www.esamskriti.com/essay-chapters/Vedic-Maths~-Every-child-deserves-it-1.aspx